Effective Fingerprinting Codes for Database

Though customer databases are so important, they can be sold under 95/46/EC and Data Protection Act law. This is a potential business. However, this business are encountering a big problem that purchaser wants to illegally distribute his database. We call them attacker. Attacker can use many schemes such as attribute, collusion and complimentary attack to achieve his goal. We have improved the technique of Thach V. Bui et. al., in which fingerprints are embedded into columns by anonymizing specific columns so that it is effective against attribute and collusion attacks. We have also proved that d-disjunct matrices are effective fingerprinting codes.